CN1998042A - Driving a matrix display - Google Patents

Driving a matrix display Download PDF

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Publication number
CN1998042A
CN1998042A CNA2005800107563A CN200580010756A CN1998042A CN 1998042 A CN1998042 A CN 1998042A CN A2005800107563 A CNA2005800107563 A CN A2005800107563A CN 200580010756 A CN200580010756 A CN 200580010756A CN 1998042 A CN1998042 A CN 1998042A
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CN
China
Prior art keywords
pixel
sub
drive signal
input signal
level
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CNA2005800107563A
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Chinese (zh)
Inventor
R·H·M·伍本
G·J·赫斯特拉
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source

Abstract

A driver (D) for a matrix display panel (1) with a pixel (Pk) comprising a first and a second sub-pixel (SP11, 12) both having an inertia, receives a first and second input signal (R, G) indicating a first and a second desired brightness transition (BT1, BT2) of the first and second sub-pixel (SP 11, 12), respectively. The driver (D) supplies a first and a second drive signal (Ra, Ga) to the first and the second sub-pixel (SP11, 12), respectively. The first and a second drive signal (Ra, Ga) are supplied at a predetermined repetition rate, and levels of the first and the second drive signal (Ra, Ga) are limited between a minimum level (MI) and a maximum level (MA). The predetermined repetition rate may be the frame or line rate. The predetermined period is the reciprocal of the predetermined repetition rate. The driver (D) comprises: a detector (LV 1) which detects whether the first drive signal (Ra) within the single predetermined period (Tf) would have to surpass the maximum level (MA) or to fall below the minimum level (MI) in order to compensate for the inertia of the first sub-pixel (SP 11), and a level adapter (AC) which increases or decreases a level of the second drive signal (Ga) if is detected that the first drive signal (Ra) would have to surpass the maximum level (MA) or fall below the minimum level (MI), respectively.

Description

Drive matrix display
Technical field
The present invention relates to be used for the method for the driver of matrix display panel, the display device that comprises this driver and driving matrix display panel.
Background technology
LCD (liquid crystal display) screen is used to show the sport video content more and more, for example is used in television receiver and the computer monitor.But, the LC material velocity in the current LCD panel is too slow, can not show all the expectation pixel brightness transitions in the independent frame time, and this causes moving image generation blooming.This problem can partly lean on known overdrive technique to alleviate.Under the situation that employing is overdrived, pixel is to use than the high level of expectation level to be driven.For example, if pixel will be carried out the jump in brightness from the low brightness values to the high luminance values, the level that will be associated with high luminance values to the pixel supply then is stably to obtain this high luminance values.But, because the LC material has inertia, just can make pixel reach this high luminance values through the number frame possibly.According to overdrive technique, to the pixel supply level higher (being also referred to as overdrive level), improve the speed of transition to force the LC material, thereby make the high value brightness of expectation to reach as quickly as possible than related level, preferably in a frame period, reach.In case pixel has reached the high value brightness of expectation, overdrive level will be replaced by associated level, remains the brightness that equals to expect with the brightness with pixel.Similarly, the level that is supplied to pixel is chosen to temporarily be lower than the expectation level, high to improve to low transition speed.
The amount of overdriving is driven the restriction of the circuit of LCD panel.In most of LCD panels, full brightness is corresponding to pixel value 255, and pixel value can not be higher than 255 (maximum fields at LC material two ends).Therefore, under the situation of 0 to 255 transition, can not use and overdrive, because will need to be higher than 255 pixel value.Similarly, minimum pixel value is 0 (two ends at the LC material does not have electric field).Also It dones't help the situation to become negative value, because the LC material responds to the amplitude of electric field, rather than its symbol.
Summary of the invention
The purpose of this invention is to provide a kind of driver that is used for matrix display panel with improved overdrive technique.
First aspect of the present invention has provided the driver described in a kind of claim 1.Second aspect of the present invention provided the display device described in a kind of claim 12.The 3rd aspect of the present invention provided the display device described in a kind of claim 13.The 4th aspect of the present invention provided the method for the driving matrix display panel described in a kind of claim 14.Defined preferred implementation in the dependent claims.
Driver according to first aspect of the present invention is used to drive the matrix display panel that comprises the pixel with first and second sub-pixels that inertia is all arranged.For example, matrix display is LCD, and its each pixel has three sub-pixels, and each sub-pixel utilizes another kind of mass-tone that the brightness and the color of pixel are contributed separately.But the present invention is significant to any other matrix display that each pixel has at least two sub-pixels and sub-pixel to have inertia (this means will spend the regular hour after driving voltage is imposed on the sub-pixel of wanting change just can reach new optical states).
This driver receives first and second input signals of the first and second expectation jumps in brightness of representing first and second sub-pixels respectively.This driver with predetermined repetition rate for example frame rate supply first and second drive signals respectively to first and second sub-pixels.Like this, the brightness degree of sub-pixel is upgraded according to frame rate.The grade of first and second drive signals is confined between minimum level and the greatest level.Usually, minimum level is equivalent to data value zero, and greatest level is equivalent to the maximum data value that driver can produce.If data comprise 8 bit data word, then maximum data value is 255.
Drive first sub-pixel even use minimum or maximum data value, the first expectation jump in brightness is also excessive and can not reach in a frame period, and the second expectation jump in brightness is less than accessible degree in the frame period simultaneously.Like this, depend on situation about maybe need not overdrive, second sub-pixel can be driven can in a frame period, experience second expect jump in brightness.
This driver comprises detecting device in addition, and whether this detecting device detects first drive signal and can or fall below the minimum level above greatest level in the frame period.Like this, since the current brightness degree of first sub-pixel and know in ending first jump in brightness in frame period and should finish, need can determine which kind of drive signal to come to obtain the brightness of expectation in the ending in frame period.If needed drive signal remains between minimum and the greatest level, then jump in brightness can be finished in the frame period.
This driver comprises in addition cuts out (clipping) compensator, can or drop on below the minimum level above greatest level if detect the ending of first drive signal in the frame period, and then this cuts out the grade that compensator increases or reduce second drive signal respectively.
Like this, according to the present invention, if the particular sub-pixel of pixel can not be carried out needed jump in brightness in an independent frame period, then at least one the brightness in other sub-pixel of pixel is adjusted the luminance errors that causes by described particular sub-pixel with compensation by driver.Like this, by this approach, can realize correct pixel brightness transitions basically.But, though the brightness that the brightness of pixel is substantially equal to expect, its color can with all deviations of desired color.Yet, have been noted that smudgy more noticeable than misalignment.
If pixel has more than two sub-pixels, then can select a luminance errors that compensates described particular sub-pixel in other sub-pixel.Alternatively, can be with the more than luminance errors that compensates described particular sub-pixel in other sub-pixel.Usually, be to be used in to use in the matrix display of overdriving according to algorithm of the present invention.Like this, for example, if described particular sub-pixel will increase its brightness by very big step-length, then overdriving to cause driving data to adopt maximal value, rather than infeasible high value.In other words, driving data is cut out maximal value.And even then also can not reach the brightness of expectation in a field duration.Difference or error between the brightness that reaches after expectation brightness and field duration are known.This error can by impel expectation brightness that one of other sub-pixel increases to its brightness it with on compensate.
In current over-driving method, the rgb pixel value is equal to be treated, and has nothing to do each other.Not cutting out of one of color component can influence other color component.Especially, in having the scanning or the display backlight that glimmers, it is very obvious to cut out the luminance error that causes, and resembles diplopia after: the diplopia image of following the motion object back on screen.
Note that the problem that US2002/0149574A1 discloses active matrix display devices (for example being used in TFT-LCD or AM-LCD in Video Applications or the data monitor) is to take place such as the smudgy such correction of motion artefacts of monitor.Movement display in the image gets smudgy, is because liquid crystal material needs a minimum time just can reach the defined given end-state of driving voltage.This solves by utilizing the pulse back light system, in the pulse back light system, in the frame period, at first complete image is carried out addressing, and to last picture capable carried out addressing after, impel light source to send in short-term intense light pulse.
But, reach their final steady state (SS)s with the at first handy ratio of pixel of the line correlation of institute addressing in the long time of the row of next stage addressing.Therefore, signal processor increases (feasible) scope (increasing " overdriving ") of the driving voltage (for example, by data voltage) at pixel two ends according to the order that drives pixel column.Though the pixel of different rows receives different overdriving, can not reach in a frame in its expectation brightness but be disclosed in one of sub-pixel, another sub-pixel in the pixel produces the brightness more higher or lower than desired brightness and compensates the luminance errors that is caused.
Claim 2 described according to embodiments of the present invention in, matrix display panel has the pixel that has at least three sub-pixels.Usually, these sub-pixels have three kinds of primary colors red, green and blues respectively.Alternatively, pixel can comprise corresponding to these sub-pixels or surpass other colors of three sub-pixels.For example, each pixel of known display has four sub-pixels, and these four sub-pixels have color red, green, blue and white.
Now, if in the ending of current predetermined period, the end value of one of sub-pixel is higher than maximal value or is lower than minimum value, then the driving of this sub-pixel is cut out.Cut out the error of compensator calculating, and adjust one of other (a plurality of) sub-pixel or wherein a plurality of brightness, with less this error comprising that this brightness of cutting out the pixel of sub-pixel causes.Best, if possible, the brightness of other (a plurality of) sub-pixel is adjusted to and can full remuneration cuts out the luminance errors of pixel.If this is feasible, so, pixel will have the brightness of expectation, and color may depart from desired color.Because can make the error minimum, all to minimum degree, so the misalignment that the result causes also can be minimized by the grade that changes all other sub-pixels.
In the described working of an invention mode according to claim 3, predetermined period is frame period or line period.This has simplified employed algorithm.
In described working of an invention mode according to claim 4, driver comprises frame memory in addition, and this frame memory receives the first previous input signal of first input signal and the previous frame of supply before current frame period in particular frame period (being called current frame period in addition).
Detecting device comprises that first ultimate value determines circuit, and this circuit receives the first previous input signal, can obtain minimum level and first and can obtain greatest level to begin to determine first from the first previous input signal.First can to obtain minimum level be by to the obtainable grade of first sub-pixel supply minimum level.First can to obtain greatest level be by to the obtainable grade of first sub-pixel supply greatest level.Second can to obtain minimum or greatest level be respectively by to second sub-pixel supply minimum or the obtainable grade of greatest level.Because sub-pixel has inertia, so the obtained minimum and the greatest level of current frame period ending depend on the current grade of sub-pixel when current frame period begins.
Cut out compensator and receive first and can obtain minimum level, first and can obtain the greatest level and second input signal, to supply second drive signal.Surpass maximum or minimum level if detect first drive signal,, then cut out compensator increases or reduce second drive signal respectively with respect to the second input signal grade grade if first drive signal is cut out in other words.
According to the described working of an invention mode of claim 6 and according to the unique difference between the described working of an invention mode of claim 4 be, now drive signal be stored in the frame memory, rather than the storage input signal.This embodiment has such advantage: what it was considered is the signal of actual displayed on matrix display, rather than input signal.Therefore, can obtain minimum and peaked prediction will be improved.
In according to claim 5 or 7 described working of an invention modes, driver comprises overdrive circuit, and this overdrive circuit is arranged for and receives drive signal and be stored in signal in the frame memory, with the supply drive signal of overdriving.Such overdrive circuit is known.If there is display gamma (gamma) corrector, this overdrive circuit can receive the drive signal through gamma correction.
In described working of an invention mode according to claim 8, grade to second drive signal is adjusted, to obtain with first drive signal of being cut out basically with the two the two jump in brightness together of average corresponding to first and second sub-pixels of expectation jump in brightness of first and second sub-pixels.
In described working of an invention mode according to claim 9, driver comprises the source gamma corrector in addition, this source gamma corrector receives and can obtain minimum level and can obtain greatest level, with to cutting out the compensator supply through the minimum level of source gamma correction with through the greatest level of source gamma correction.If it can not be best that source video signal, is then cut out compensation performance through gamma precorrection, because signal value and brightness do not have linear relationship.Therefore, best, input signal is carried out the source gamma correction, to obtain the linear relationship between calibrated input signal and the brightness.
In described working of an invention mode, in display gamma corrector, drive signal is proofreaied and correct, with the calibrated drive signal of the gamma that obtains the match display screen according to claim 10.
In the described working of an invention mode according to claim 11, matrix display panel has the pixel that has at least three sub-pixels.Usually, three sub-pixels have three kinds of primary colors, are respectively red, green and blue.Alternatively, pixel can comprise more than three sub-pixels.For example, each pixel of known display has four sub-pixels, has color red, green, blue and white.
Now, all input signals all are stored in the frame memory, and obtained minimum and the maximal value of all input signals when the frame period ends up is to begin to determine from the value that is stored in the frame memory.If one of sub-pixel (or wherein a plurality of) can be higher than maximal value or be lower than minimum value in the end value of current frame period ending place, then the driving of sub-pixel is cut out.Cutting out compensator calculates comprising the error that this brightness of cutting out the pixel of sub-pixel causes and adjusting other (a plurality of) non-brightness of cutting out sub-pixel and come less this error.Best, if feasible, (a plurality of) non-brightness of cutting out sub-pixel is adjusted to and can full remuneration cuts out the luminance errors of pixel.If this is feasible, so, pixel can have the brightness of expectation, and color can depart from desired color.
Alternatively, drive signal is stored in the storer, determines to obtain minimum and maximal value being used for.Can obtain minimum and maximal value now so that more high precision is definite, because use is the actual initial brightness degree of sub-pixel, rather than input signal.
With reference to the embodiment of hereinafter introducing, these and other advantage of the present invention will be apparent, and with reference to the embodiment of hereinafter introducing these and other advantage of the present invention is set forth explanation.
Description of drawings
In the accompanying drawings:
The block diagram of accompanying drawing 1 expression display device,
Accompanying drawing 2 expression is used to drive the selection signal and the data-signal of the sub-pixel of the matrix display shown in the accompanying drawing 1,
Accompanying drawing 3 expression is corresponding to the brightness as the sub-pixel of the function of time of several drive signal grades,
Accompanying drawing 4 expressions are used for the existing feed-forward overdrive circuit of matrix display panel,
The enquiry form that uses in the existing feed-forward overdrive circuit of accompanying drawing 5 expressions,
Accompanying drawing 6 expressions are used for the existing feedback overdrive circuit of matrix display panel,
The block diagram that accompanying drawing 7 is represented according to the embodiment of matrix display of the present invention,
The block diagram that accompanying drawing 8 is represented according to the another kind of embodiment of matrix display of the present invention,
Accompanying drawing 9 expression according to the block diagram of the another kind of embodiment again of matrix display of the present invention and
Accompanying drawing 10 expression explanation is according to the process flow diagram of the example of the algorithm that is used to cut out compensation of the present invention.
Embodiment
The block diagram of accompanying drawing 1 expression display device.This display device comprises signal processing circuit SPC and comprises the display device of driver D and matrix display panel 1.Matrix display panel 1 comprise the sub-pixel SPij related with selection electrode SEi that intersects and data electrode DEj (SP11, SP12, SP21, SP22, SP1n, SP2n, SPml, SPmn).Subscript i represents to involve selection electrode SEi, and following table j represents to involve data electrode DEj.As just example, the matrix display panel 1 shown in the accompanying drawing 1 has square sub-pixel SPij and comprises the pixel Pk of four sub-pixel Sij (shown pixel P1 comprises sub-pixel SP11, SP12, SP21 and SP22) separately.Sub-pixel SPij can have other size, such as rectangle; Pixel Pk can comprise less than or surpass three sub-pixel SPij.Four sub-pixel SP11, SP12, SP21, the SP22 of pixel P1 can have red, green, blue and white colour according to any order.Subscript i, j and k are used for representing generally continuous item, if pay close attention to a certain, then numerical value are given these subscripts.
Driver D comprises selection driver SD, data driver DD, data processor DP and timing control circuit TC.This driver can be formed by one or more integrated circuit, and perhaps the electronic module by one or more additional assemblies that comprise described one or more integrated circuit and choose wantonly forms.Signal processing circuit converts external input signal EIV to the form of incoming video signal IV.This equipment can be televisor, monitor, pocket computer, PDA or any other products that has display.External input signal can be an aerial signal or from any other signal such as the such video source of computing machine or DVD player.
Data processor DP receives incoming video signal IV, incoming video signal IV generally includes three kinds of input signal R, G and B, these three kinds of input signals are the representative color red, green and blue respectively, and these three kinds of input signals determine brightness and the color of incoming video signal IV together.Suppose the suitable digital signal of number of the pixel Pk of number that these three kinds of input signal R, G, B are data pixels and matrix display panel 1.If vision signal IV is a simulating signal, then at first will be with its digitizing.If the number of data pixels also is not equal to the number of pixel Pk, then to carry out conversion.This conversion is normally carried out by known route marker.Data processor DP is to data driver DD supplies drive signals Ra, Ga, Ba.
Timing controller TC receives horizontal-drive signal Hs and the vertical synchronizing signal Vs of incoming timing controller vision signal IV, to select driver SD supply control signal CS2 to data driver DD supply control signal CS1 and to selection.Timing controller TC makes the sample-synchronous of selecting driver SD and data driver DD and input video IV and makes them synchronized with each other.Select driver SD to selecting electrode SEi supply to select signal Si (S1 is to Sm), normally select electrode SEi one by one.Data driver is via data electrode DEj supplies data signals Dj (D1 is to Dn), with drive with select electrode SEi in the sub-pixel SPij that is associated of the selection electrode selected.
Accompanying drawing 2 expression is used to drive the selection signal and the data-signal of the sub-pixel of matrix display.In all accompanying drawings 2, transverse axis is represented the time.Accompanying drawing 2A represents to select among the electrode SEi first to select strobe pulse S1 on electrode.Accompanying drawing 2B represents to select second strobe pulse S2 that selects on the electrode among the electrode SEi.Accompanying drawing 2C represents to select the strobe pulse Sm at least one selection electrode among the electrode SEi.Accompanying drawing 2D represents the data pulse Dj on the data electrode DEj.
Current frame period Tf begins and in moment t0 ' end at moment t0.During the frame period Tfp formerly, selected last to select electrode by the pulse Sm that just before moment t0, occurs.Last selects the data Dj of electrode to schematically show with cross to be supplied to this.In accompanying drawing 2D, cross represent different pieces of information signal D1 to the different pieces of information level of Dn be supply concurrently and therefore overlap each other.During current frame period Tf, what select from moment t0 to moment t1 is the first selection electrode, because select signal S1 to have high level during this first selection cycle Ts1.In other display, select electrode to select with low level or negative level.During this first selection cycle Ts1, the parallel data D1 that is supplied to data electrode DEj will only influence the sub-pixel SP11 that is associated with the first selection electrode to SP1n to Dn.What select from moment t1 to moment t2 is the second selection electrode, because select signal S2 to have high level during second selection cycle Ts2.During this second selection cycle Ts2, data D1 only influences with second to Dn and selects sub-pixel SP21 that electrode is associated to SP2n.T0 ' selection is that last selects electrode from moment tm to the moment, because in the end select signal Sm to have high level during a selection cycle Tsm.During this last selection cycle Tsm, data D1 only influences with last to Dn and selects sub-pixel SPm1 that electrode is associated to SPmn.
Next frame period Tfn is in moment t0 ' beginning, and t1 ' selection is the first selection electrode from moment t0 ' to the moment, because select signal S1 to have high level during the mat woven of fine bamboo strips one selection cycle Ts1 ' of next frame period Tfn.T2 ' selection is the second selection electrode from moment t1 ' to the moment, because select signal S2 to have high level during this second selection cycle Ts2 ' of next frame period Tfn.
Accompanying drawing 3 expression is corresponding to the sub-pixel brightness as the function of time of several drive signal level.The brightness of first sub-pixel among the sub-pixel SPij of accompanying drawing 3A remarked pixel P1, this first sub-pixel among the sub-pixel SPij is called the first sub-pixel SP11 in addition, and accompanying drawing 3B represents to be called in addition the brightness of second sub-pixel among the sub-pixel SPij of the second sub-pixel SP12.These two ingredients that sub-pixel SPij is same pixel P1.
In accompanying drawing 3A, sub-pixel SP11 is SV1 at the brightness value of moment To.Therefore expectation brightness degree at the end of a frame period Tf is the expectation brightness degree at moment Tf, is DL1.Do not overdrive if use, then sub-pixel SP11 be with the corresponding drive of data of representing this expectation brightness degree DL1.Because the LC material has inertia, therefore will just can reach the brightness of expectation through several frame periods Tf sub-pixel SP11, referring to curve B Ra.Now, final, on the position near moment 3Tf, the brightness of sub-pixel SP11 has reached the brightness degree DL1 of expectation, but after a frame period Tf, at moment Tf place, the brightness degree that is reached only is RL1.If in a frame period Tf, just at moment Tf place, should reach the brightness degree DL1 of expectation, should apply the overdrive data signal corresponding to sub-pixel SP11 with brightness degree OL1.Shown in dotted line BRc, just reached the brightness DL1 of expectation now at moment Tf.
But, usually, data-signal is confined to and can be used to the corresponding maximal value of maximum voltage of driven element pixel SPij.In accompanying drawing 3A, suppose under stable form, to have maximum data signal, brightness changes according to the mode shown in the dotted line BRb.Like this, finally can reach corresponding high-high brightness MAL with maximum drive signal level MA.Therefore, between the expectation brightness degree DL1 that the brightness RR1 that moment Tf reaches reaches when not adopting the brightness degree RL1 that reaches when overdriving and adopting overdriving of not cutting out.Like this, because drive signal has been carried out cutting out and the result causes data-signal to be cut out, so can not in a frame period Tf, reach the brightness degree DL1 of expectation.
Difference between grade DL1 and the grade OL1 is called the needed ODR1 of overdriving.Maximum possible grade MAL and the difference that reaches between the expectation brightness desired grade OL1 at moment Tf are called ODS1.This part of O DSI that drives can not be accomplished, because data-signal can't have the peaked value that is higher than it.Difference between maximum possible grade MAL and the desired grade DL1 is represented by OD1, and the difference between start level SV1 and the desired grade DL1 is called expectation jump in brightness BT1.
Accompanying drawing 3B and accompanying drawing 3A are closely similar, and sub-pixel SP12 will carry out the jump in brightness BT2 from start level SV2 to expectation grade DL2 now.This jump in brightness BT2 can overdrive and reaches in a frame period by use.Can clearly be seen that from accompanying drawing 3B sub-pixel SP12 can carry out bigger jump in brightness.The maximum possible jump in brightness is represented by BTm.Because sub-pixel SP11 and SP12 are the ingredients of same pixel P1, therefore cause the brightness of pixel P1 to overdrive and to obtain compensating in the brightness of moment Tf by increasing sub-pixel SP12 to small part cutting out of the low excessively pixel SP11 of moment Tf.
In accompanying drawing 3B, sub-pixel SP12 is SV2 at the brightness value of moment To.At the expectation brightness degree of a frame period end,, be DL2 just at the expectation brightness degree at moment Tf place.Do not overdrive if use, then sub-pixel SP12 is what to use with the corresponding drive of data of representing this expectation brightness degree DL2.Because the LC material has inertia, therefore will just can reach the brightness degree DL2 of expectation through several frame periods Tf sub-pixel SP12, referring to curve B Rd.Like this, final, on the position near moment 3Tf, the brightness of sub-pixel SP2 reaches expectation brightness degree DL2.But after a frame period Tf, at moment Tf place, the brightness degree that is reached only is RL2.If in a frame period Tf, just at moment Tf place, should reach expectation brightness degree DL2, then should be to sub-pixel SP12 supply and the corresponding overdrive data signal of brightness degree OL2.Shown in dotted line BRe, reached expectation brightness DL2 at moment Tf place now.
Equally, data-signal is confined to and can be used to the corresponding maximal value of maximum voltage of driven element pixel SPij.In accompanying drawing 3B, suppose that shown in dotted line BRf maximum drive signal MA should be able to finally reach the corresponding level with brightness degree MAL.Therefore, at moment Tf, sub-pixel SP12 can reach high-high brightness OL2a, and this high-high brightness is much larger than the brightness degree DL2 of expectation.Like this, can make this sub-pixel SP12 increase to greatest level OL2a, to compensate sub-pixel SP11 at least in part in the low excessively brightness of moment Tf in the brightness of moment Tf.
Difference between grade DL2 and the grade OL2 is called the needed OD2 of overdriving.Difference between maximum possible grade MAL and the grade OL2 is called ODR2.The brightness that can use this difference ODR2 to increase sub-pixel SP12.Difference between grade RL2 and the grade OL2a is represented by OD2a.
Though what two figure in the accompanying drawing 3 represented is the jump in brightness that sub-pixel SP11 and SP12 carry out to brighter state, for reverse jump in brightness the identical effect of cutting out can take place.If another in the sub-pixel do not cut out, then can carry out luminance compensation.Certainly, if the jump in brightness of sub-pixel SP11 and SP12 is reverse, compensation also is feasible.
Accompanying drawing 4 expressions are used for the existing feed-forward overdrive circuit of matrix display panel.Received image signal IV is stored among the frame buffer FB and with it is supplied to the data input pin DE of overdrive circuit OV.Frame buffer FB is to the received image signal IVp of another data input pin SV of overdrive circuit OV supply through postponing.Through the received image signal IVp that postpones is the input signal IV that postpones a frame period Tf.Like this, overdrive circuit OV all can receive for each sub-pixel SPij the sub-pixel SPij during the previous frame period Tfp of representative brightness degree previous data I Vp and represent the current data IV of the brightness degree that sub-pixel SPij should reach at current frame period Tf.Overdrive circuit OV uses form 1 and 2 (5 explanations with reference to the accompanying drawings) to determine the grade of extremely drive data DA.
The enquiry form that uses in the existing feed-forward overdrive circuit of accompanying drawing 5 expressions.
Accompanying drawing 5A represents to provide the form 1 of the response RV of sub-pixel SPij.The initial data grade of sub-pixel SPij or previous data I Vp provide in Far Left one row of matrix.Actual driving data grade DA provides in the top line of matrix.The initial data grade IVp that provides from Far Left one row begins, for example from grade 192, can find, if this sub-pixel SPij drives with a certain grade in the top line, for example grade 16, then can be from the row of 192 beginnings in left side and the class 5 as a result 0 that finds a frame period Tf will occur afterwards from the corresponding cell of the intersection point of row of 16 beginnings at top.Like this, in this example, after a frame period, not to carry out and from 192 to 16 the corresponding jump in brightness of data transition, but carry out and from 192 to 50 the corresponding jump in brightness of data transition.Sub-pixel SPij will have too high brightness degree after a frame period.The luminance errors that is caused is equivalent to data difference 34, if recognize that the difference between zero luminance and the high-high brightness is a data difference 255, then data difference 34 is sizable amounts.
Accompanying drawing 5B represents to provide the form 2 of over-drive value.Equally, in Far Left one row of matrix, provide the initial data grade IVp of sub-pixel SPij.In the top line of matrix, provide the driving data grade IV of expectation.For the same example that reference accompanying drawing 5A provides, can find, if start level be 192 and desired grade be 16, then to be applied as 0 drive signal DA.The grade 16 that the shadow representation of value 0 will reach expectation should need lower value.Therefore applied over-drive value is cut out and is available minimum value (being 0), and from form 1 as can be seen, the grade as a result after frame period will be 40, rather than 16.
In the prior art, each sub-pixel SPij is handled in an identical manner.If one of sub-pixel SPij of pixel Pk cuts out like this, then the total brightness of this pixel Pk when frame period Tf finishes be not too high be exactly low.This can cause the motion parts of image smudgy.The present invention comes compensated for brightness deviations by the non-brightness of cutting out sub-pixel SPij that changes pixel Pk.This can cause the color deviation desired color of pixel P.But it is obviously fuzzy to seem that misalignment does not have that luminance deviation causes.
Accompanying drawing 6 expressions are used for the existing feedback overdrive circuit of matrix display panel.Overdrive circuit OV receives received image signal IV, receives initial value DAp at initial value input end SV at data input pin DE, and supply extremely drive data DA and response RV.Input picture value IV represents input picture to display.Extremely drive data DA is supplied to one of sub-pixel SPij of display panel 1.Frame buffer FB receives the response RV that is supplied by overdrive circuit OV and will postpone to be supplied to as initial value DAp above the response RV of a frame period Tf initial value input end SV of overdrive circuit OV.Like this, for each sub-pixel SPij, overdrive circuit OV receive the input picture value of the brightness degree that the initial value of the brightness degree during the expression sub-pixel SPij frame period Tfp formerly or previous data DAp and expression sub-pixel SPij should reach during current frame period Tf or current data IV the two.Usually, overdrive circuit OV uses two known forms to determine the grade of extremely drive data DA and the value of response RV.
Accompanying drawing 7 expressions are according to the block diagram of the embodiment of matrix display of the present invention.In the present embodiment, pixel Pk has three sub-pixel SPij separately, and these three sub-pixels have the color red, green and blue respectively.Input signal IV comprises color component R, G, B, and expression has the brightness of triplet of the sub-pixel of color red, green, blue respectively.Color component R, G, B are stored among the frame memory FM, to obtain color component Rp, Gp, Bp, the color component of the triplet (triplet) of the frame period Tfp that these color component representatives are previous through postponing.In addition color component R, G, B are supplied to grade to adjust circuit AC, this grade is adjusted circuit AC adjusts color component R, G, B under the control of control signal CS grade, with color component Ra, Ga, the Ba that adjusts to display supply process.
Testing circuit LV1 receives minimum and maximal value MI and MA, color component R and the color component Rp through postponing, with supply control signal CR.Whether control signal CR represents from beginning and know to expect to have color component value R after frame period Tf through the color component value Rp that postpones, overdrive and caused cutting out minimum M I or maximal value MA.If like this, just known that the brightness meeting of red sub-pixel departs from the brightness of expectation in the ending of frame period Tf.
Testing circuit LV2 receives minimum and maximal value MI and MA, color component G and the color component Gp through postponing, with supply control signal CG.Control signal CG represents that the color component value Gp that postpones begins and known the requirement has color component value G from passing through, and whether overdrives and has caused cutting out minimum M I or maximal value MA after frame period Tf.If like this, just known that the brightness meeting of green sub-pixels departs from the brightness of expectation in the ending of frame period Tf.
Testing circuit LV3 receives minimum and maximal value MI and MA, color component B and the color component Bp through postponing, with supply control signal CB.Control signal CB represents that the color component value Bp that postpones begins and known the requirement has color component value B from passing through, and whether overdrives and has caused cutting out minimum M I or maximal value MA after frame period Tf.If like this, just known that the brightness meeting of blue subpixels departs from the brightness of expectation in the ending of frame period Tf.Minimum M I can be identical with maximal value MA for each color component, but also can be different to each color component.
Control signal CR, CG, CB are supplied to control circuit CO, and this control circuit CO produces control signal CS.Best, if taken place to cut out, then control signal CS comprises and shows to cut out and pairing clip boundary takes place and by the information of cutting out the error that causes.Perhaps, if do not cut out generation, the available leeway with respect to minimum and maximum possible drive level can appear before cutting out then.Control signal CS determines color component Ra, Ga, Ba through adjusting according to color component R, G, B.For example, if the color component Rp and the color component R that detect through postponing have the value that causes such result: owing to overdrive, the value of the color component Ra that process is adjusted should be higher than maximal value MA, and this is cut out maximal value through the color component Ra that adjusts.This deterministic process can be based on the use of the form of accompanying drawing 5.From these forms, it is now know that can occur in the result of frame period Tf for which kind of luminance deviation.Preferably as wide as possible,, so that obtain to have color component Ga and the Ba that is higher than the required grade of brightness degree that arrival shows by color component G and B, compensate this luminance deviation through adjusting by control color component G and B one or both of.
Circuit AC can for example pass through digital value and the multiplication of being determined by control signal CS with color component R, G, B in known manner with the gain of digital means control color component R, G and B.Control signal CS can comprise multiplication coefficient.Do not adopt and utilize controller CO and circuit AC to determine and apply the means of overdriving, can realize the existing overdrive circuit of handling through the color signal Ra, the Ga that adjust and Ba yet.Without color component R, G, B, also can will be stored among the frame memory FM through color signal Ra, Ga and the Ba that adjusts.This has such advantage: the value that is actually used in driven element pixel SPij can be used for also determining whether these values are fallen under the minimum M I or above maximal value MA.
Accompanying drawing 8 expressions are according to the block diagram of the another kind of embodiment of matrix display of the present invention.
Previous color component value Rp, Gp, the Bp of the color component value of previous frame represented in frame buffer FB storage color component value R, G, B and supply.
Previous color component value Rp is supplied to the arranged in series of functional block Fr, source gamma (gammar) piece Hr and digital multiplier Mr.I acquisition value Rmi during the functional block Fr output present frame, this value is to begin to determine from previous color component value Rp by supply minimum value (being generally 0).Functional block Fr exports maximum in addition can acquisition value Rma, and this value is to begin to determine from previous color component value Rp by supply maximal value (being 255 in the system with 8 bit data word).This operation can by relevant value (IVp in the form just), which RV value of inquiring about Rp correspond respectively to that DA=0 and DA=255 carry out by the form 1 that uses accompanying drawing 5A.Available source gamma block Hr proofreaies and correct the source gamma and supply minimum and maximal value rmi and the rma linear corresponding with the brightness of sub-pixel Spij that may be applied to source images.Multiplier Mr will be worth rmi and rma and factor alpha and multiply each other, to obtain minimum and maximal value Rmin and the Rmax through overcorrect.
Previous color component value Gp is supplied to the arranged in series of functional block Fg, source gamma block Hg and digital multiplier Mg.Functional block Fg exports I acquisition value Gmi, and this value is to begin to determine from previous color component value Gp by the supply minimum value.Functional block Fg exports maximum in addition can acquisition value Gma, and this value is to begin to determine from previous color component value Gp by the supply maximal value.Available source gamma block Hg correction may be applied to the source gamma of source images to obtain minimum and maximal value gmi and the gma linear corresponding with the brightness of sub-pixel Spij.Multiplier Mg will be worth mi and gma and factor alpha and multiply each other, to obtain minimum and maximal value Gmin and the Gmax through overcorrect.
Previous color component value Bp is supplied to the arranged in series of functional block Fb, source gamma block Hb and digital multiplier Mb.Functional block Fb exports I acquisition value Bmi, and this value is to begin to determine from previous color component value Bp by the supply minimum value.Functional block Fb exports maximum in addition can acquisition value Bma, and this value is to begin to determine from previous color component value Bp by the supply maximal value.Available source gamma block Hb correction may be applied to the source gamma of source images to obtain minimum and maximal value bmi and the bma linear corresponding with the brightness of sub-pixel Spij.Multiplier Mb will be worth bmi and bma and factor alpha and multiply each other, to obtain minimum and maximal value Bmin and the Bmax through overcorrect.
Usually, luminosity is by equation Y=α R+ β G+ γ B.Therefore, multiplying each other with factor alpha, β and γ is in order to obtain color component value R, G, the B contribution to luminance value Y.
In addition color component value R is supplied to the arranged in series of available source gamma block Hr ' identical and the multiplier Mr ' identical with multiplier Mr function with source gamma block Hr function.This series arrangement supplies is through the color component value R ' of overcorrect.
In addition color component value G is supplied to the arranged in series of available source gamma block Hg ' identical and the multiplier Mg ' identical with multiplier Mg function with source gamma block Hg function.This series arrangement supplies is through the color component value G ' of overcorrect.
In addition color component value B is supplied to the arranged in series of available source gamma block Hb ' identical and the multiplier Mb ' identical with multiplier Mb function with source gamma block Hb function.This series arrangement supplies is through the color component value B ' of overcorrect.
Cutting out compensator CC receives through minimum value Rmin, the Gmin of overcorrect and Bmin, maximal value Rmax, Gmax through overcorrect and Bmax and through color component value R ', G ' and the B ' of overcorrect, to produce color component value Ra, Ga and the Ba through adjusting respectively.Cut out compensator CC and for example carry out the algorithm that illustrates with reference to accompanying drawing 9.In brief, for instance, for green component G, if the green component values G ' that detects through revising has the value that is within the scope that is defined by value Gmin and Gmax, then can obtain this value through the green component G ' that revises in a frame period Tf, and not need the brightness of pixel Pk is revised: the value of Ga and G ' are the same (if in other color component of pixel Pk any one not cut out).If the green component values G ' that detects through revising has the value that is not within the scope that is defined by value Gmi n and Gmax, then to cut out immediate that value to the value value of cutting out Gmin or the Gmax of this G '.The value of Ga equals Gmin or Gmax like this, now.Therefore, can not in a frame period, obtain the green sub-pixels SPij brightness of expectation, and cut out compensator CC and attempt the luminance deviation that comes the pixel Pk that compensation result causes through the color component R ' of overcorrect or among the B ' at least one by adjusting.
To be supplied to the arranged in series of multiplier Mir, available display gamma corrector Kr and overdrive circuit Or through the color component value Ra that adjusts.Multiplier Mir multiplies each other color component value Ra and coefficient 1/ α, with the value of providing Ra1.Display gamma corrector Kr reception value Ra1 and the nonlinear transfer function that provides at display panel 1 have carried out the value Ra2 that proofreaies and correct.Overdrive circuit Or (itself is known) reception value Ra2 and previous color component value Rp are to provide the red output signal Ra ' that is used to drive red sub-pixel SPij.Optionally, if source gamma correction Hr, Hr ' and/or display gamma Kr are present in other the branch road, then must have corresponding same gamma correction, the previous color component value Rpg that previous color component value Rp is converted to through gamma correction is supplied to overdrive circuit Or again.
To be supplied to the arranged in series of multiplier Mig, available display gamma corrector Kg and overdrive circuit Og through the color component value Ga that adjusts.Multiplier Mig multiplies each other color component value Ga and coefficient 1/ β, with the value of providing Ga1.Display gamma corrector Kg reception value Ga1 and the nonlinear transfer function that provides at display have carried out the value Ga2 that proofreaies and correct.Overdrive circuit Og reception value Ga2 and previous color component value Gp are to provide the green output signal Ga ' that is used to drive green sub-pixels SPij.Optionally, if source gamma correction Hg and/or display gamma Kg are present in other the branch road, then must have corresponding same gamma correction, the previous color component value Gpg that previous color component value Gp is converted to through gamma correction is supplied to overdrive circuit Og again.
To be supplied to the arranged in series of multiplier Mib, available display gamma corrector Kb and overdrive circuit Ob through the color component value Ba that adjusts.Multiplier Mi b multiplies each other color component value Ba and coefficient 1/ γ, with the value of providing Ba1.Display gamma corrector Kb reception value Ba1 and the nonlinear transfer function that provides at display have carried out the value Ba2 that proofreaies and correct.Overdrive circuit Ob reception value Ba2 and previous color component value Bp are to provide the blue output signal Ba ' that is used to drive blue subpixels SPij.Optionally, if source gamma correction Hb and/or display gamma Kb are present in other the branch road, then must have corresponding same gamma correction, the previous color component value Bpg that previous color component value Bp is converted to through gamma correction is supplied to overdrive circuit Ob again.
Multiplier Mir, Mig and Mib change over linear light value according to luminosity Y, the brightness value of Y=α R+ β G+ γ B.
Accompanying drawing 9 expressions are according to the block diagram of the another kind of embodiment again of matrix display of the present invention.This embodiment is almost identical with the embodiment that reference accompanying drawing 8 is introduced.Identical item relates to identical functions or signal, need not to illustrate once more.Unique difference is, that frame buffer FB receives now is Ra2, Ga2, Ba2, rather than color component value R, G, B.Because value Ra2, Ga2, Ba2 or Ra ', Ga ', Ba ' are the expression-forms that better is presented at the content on the display panel 1 than color component value R, G, B, cut out compensator CC and will more accurately work.
Accompanying drawing 10 expression explanation is used for the process flow diagram according to the example of the algorithm of cutting out compensation of the present invention.
In step S1, receive the value of color component R, G, B and determine minimum value Rmin, Gmin, Bmin and maximal value Rmax, Gmax, Bmax by previous color component Rp, Gp, the value of Bp (being color component R, the G of previous frame, the value of B).Can be at form 1 (accompanying drawing 5A) if in which will reach by the value of searching previous color component Rp, Gp that motivation value is zero correlation, Bp and be worth and draw minimum value Rmin, Gmin, Bmin.Can be at form 1 (accompanying drawing 5A) if in be which maximal value (being value 255 in this example) previous color component Rp, the Gp that is correlated with, the value of Bp will reach and be worth and draw maximal value Rmax, Gmax, Bmax by searching motivation value.
In step S2, the value that will be preset as color component R, G, B through color component value Ra, Ga and the Ba of adjustment.If any one among color component R, G, the B should do not cut out, then should have the value of color component R, G, B through component value Ra, Ga, the Ba that adjusts.
In step S3, whether whether inspection be between minimum value Rmin and the maximal value Rmax, be between minimum value Rmin and the maximal value Rmax through the color component value Ba that whether the color component value Ga that adjusts is between minimum value Gmin and the maximal value Gmax and process is adjusted through the color component value Ra (making this value equal the value of R in the step formerly) that adjusts.If these conditions all are sure, then any one among motivation value Ra, Ga, the Ba should do not cut out, and do not need the value of color component R, G, B is adjusted.Therefore, in step S18, value Ra, Ga and the Ba the same with the value of color component R, G, B are outputed to display panel 1, normally export via data driver DD.If one of these conditions are for negative, then at least one in the color cut out, and algorithm proceeds to step S4.
In step S4, the action that detects following situation and take to be mentioned.If the value of R is higher than Rmax, variable Er is set to difference R-Rmax.If the value of R is lower than Rmin, then variable Er is set to difference R-Rmin.This difference Er is to by the indication of cutting out the luminance errors that red component causes, and can be used for the brightness of other sub-pixel SPij of correction pixels Pk.Other R values for all, variable Er is set to zero.If do not cut out generation, then do not cause luminance errors, and need in other sub-pixel SPij of pixel Pk, not carry out gamma correction.If the value of G is higher than Gmax, then variable Eg is set to difference G-Gmax.If the value of G is lower than Gmin, then variable Eg is set to difference G-Gmin.Other G values for all, variable Eg is set to zero.If the B value is higher than Bmax, then variable Eb is set to difference B-Bmax.If the value of B is lower than Bmin, then variable Eb is set to difference B-Bmin.Other B values for all, variable Eb is set to zero.
In step S5, the value of Ra is set to difference R-Er, and the value of Ga is set to and G+0.5Er, and the value of Ba is set to B+0.5Er.Like this, if red color clips, then the gamma correction of other two the sub-pixel SPij by adjusting pixel Pk the luminance deviation of related pixel Pk, described other two sub-pixel SPij have half of error E r separately.This only carried out correction latter two in the value Ga of overcorrect and Ba under any one situation of not cutting out effectively.Can make this algorithm complicated more.The amount of proofreading and correct blue component B and green component G can be different.If certain misalignment is of value to the obvious degree minimum that makes misalignment, different correcting values can be correlated with.If the correction of one of color component G or B has caused cut out, then need different correcting values, can further proofread and correct another color component before cutting out generation this moment.
In step S6, carry out with step S3 in identical inspection.Whether cutting out, cut out really the color that occurs in the red channel and proofread and correct other without any a color does not now cause and cuts out.Will in step S18, export the value that in S5, obtains.If at least one condition negates, then or whether red channel is being cut out, or be to cut out now through one of color of overcorrect.
In step S7, the value of Ga is set to difference G-Eg, and the value of Ra is set to and R+0.5Eg, and the value of Ba is set to B+0.5Eg.Like this, if green color clips, then the gamma correction of other two the sub-pixel SPij by adjusting pixel Pk the luminance deviation of related pixel Pk.This only carried out correction latter two in the value Ra of overcorrect and Ba under any one situation of not cutting out effectively.Equally, considered that misalignment that the result causes and/or other algorithm of cutting out of other sub-pixel SPij also are feasible.
In step S8, carry out with step S3 in identical inspection.Whether cutting out, cut out really the color that occurs in the green channel and proofread and correct other without any a color does not now cause and cuts out.Will in step S18, export the value that in S7, obtains.If at least one condition negates, then or whether green channel is being cut out, or be to cut out now through one of color of overcorrect.
In step S9, the value of Ba is set to difference B-Eb, and the value of Ra is set to and R+0.5Eb, and the value of Ga is set to G+0.5Eb.Like this, if blue color clips, then the gamma correction of other two the sub-pixel SPij by adjusting pixel Pk the luminance deviation of related pixel Pk.This only carried out correction latter two in the value Ra of overcorrect and Ga under any one situation of not cutting out effectively.Equally, considered that misalignment that the result causes and/or other algorithm of cutting out of other sub-pixel SPij also are feasible.
In step S10, carry out with step S3 in identical inspection.Whether cutting out, cut out really the color that occurs in the blue channel and proofread and correct other without any a color does not now cause and cuts out.Will in step S18, export the value that in S9, obtains.If at least one condition negates, then or whether blue channel is being cut out, or be to cut out now through one of color of overcorrect.
In step S11, the value of Ra is set to difference R-Er, and the value of Ga is set to and G-Eg, and the value of Ba is set to G+Er+Eg.If red and green channel is all being cut out, then this should be able to be correct compensation.This compensation is perfect under the situation that blue channel is not cut out after overcorrect only.
In step S12, carry out with step S3 in identical inspection.Whether cut out, cut out really and occur in redness and the green channel and proofread and correct blue the introducing and cut out without any a color now.Will in step S18, export the value that in S11, obtains.If at least one condition negates, then otherwise whether red and green channel cutting out, or be that present blue channel is being cut out.Equally, other algorithm also is feasible, and for the situation that all causes luminance errors at red and green channel in the two, the brightness in can not the full remuneration blue channel also is acceptable.
In step S13, the value of Ra is set to difference R-Er, and the value of Ga is set to and G+Er+Eb, and the value of Ba is set to B-Eb.If red and blue channel is all being cut out, then this should be able to be correct compensation.This compensation is perfect under the situation that green channel is not cut out after overcorrect only.Equally, the part compensation also is an acceptable.
In step S14, carry out with step S3 in identical inspection.Whether cut out, cut out really and occur in redness and the blue channel and proofread and correct green the introducing and cut out without any a color now.Will in step S18, export the value that in S13, obtains.If at least one condition negates, then otherwise whether red and blue channel cutting out, or be that present green channel is being cut out.
In step S15, the value of Ra is set to difference R+Eg+Eb, and the value of Ga is set to and G-Eb, and the value of Ba is set to B-Eb.All cutting out as fruit green and blue channel, then this should be able to be correct compensation.This compensation is perfect under the situation that red channel is not cut out after overcorrect only.Equally, the part compensation also is an acceptable.
In step S16, carry out with step S3 in identical inspection.Whether cut out, cut out really and occur in green and the blue channel and proofread and correct red the introducing and cut out without any a color now.Will in step S18, export the value that in S15, obtains.If at least one condition negates then will all three colors all to cut out or best the correction can not be arranged.Now, in step S17, the value of Ra is set to R-Er, and the value of Ga is set to G-Eg, and the value of Ba is set to B-Eb.
Clearly, can change above-mentioned algorithm, and can not exceed scope of the present invention.For example can be individually whether the previous color component value Rp of each colour of solution be in this condition in the scope of value Rmin and Rmax.Can depend on the situation that detects then, determine the required compensation of cutting out.Can also proofread and correct because of cutting out the luminance errors that error causes of cutting out of sub-pixel SPij by the grade of proofreading and correct other sub-pixel with different amounts.But, best, this error is evenly dispersed on other color, to obtain minimum misalignment.But this is not always feasible, such as the situation that causes other color to cut out because of correction.
It should be noted that embodiment above-mentioned is illustrative, rather than will limit the invention, and those skilled in the art can design much can be for other embodiment of selecting for use, and can not exceed the scope of claims.
In the claims, place any Reference numeral of bracket all to should not be construed as to be qualification to claim.Speech " comprises " and the element unlisted in the claim or the situation of step of existing do not got rid of in synon use.Place element speech " " or " " before not get rid of the situation that has a plurality of this kind elements.The present invention can realize by the hardware of the element that comprises several different in kinds, and can realize by suitable program control computing machine.In listing the claim to a product of several devices, several in these devices can be by hardware one and realize with a part.In different mutually dependent claims, quote this surface phenomena of specific means and do not show that the combining form of these means is unprofitable to realize advantage.

Claims (14)

1. driver (D) that is used for matrix display panel, this matrix display panel has and comprises the first and second sub-pixel (SP11 that all have inertia, SP12) pixel (Pk), this driver is used in response to representing the first and second sub-pixel (SP11 respectively, SP12) the first and second expectation jump in brightness (BT1, BT2) the first and second input signal (R, G), with predetermined repetition rate respectively to the first and second sub-pixel (SP11, SP22) the supply first and second drive signal (Ra, Ga), this driver (D) comprising:
-be used for detecting first drive signal (Ra) and whether will surpass greatest level (MA) or drop on minimum level (MI) following so that make the sub-pixel of winning (SP11) can be at an independent predetermined period (Tf for the inertia that compensates first sub-pixel (SP11); TS1) finish the device (LV1 of the first expectation jump in brightness (BT1) within basically; CC, Fr, Fg, Fb), wherein predetermined period be predetermined repetition rate inverse and
-be used to adjust the first and/or second drive signal (Ra, Ga) with the compensation inertia and be used for detect first drive signal (Ra) can will exceed greatest level (MA) or fall device (AC, the CO that increases or reduce the grade of second drive signal (Ga) under the situation below the minimum level (MI) respectively; CC).
2. according to the described driver of claim 1, wherein
Pixel (Pk) comprises the 3rd sub-pixel (SP21) in addition, driver (ID) is arranged for the 3rd input signal (B) that the third phase prestige jump in brightness of the 3rd sub-pixel (SP21) is represented in further reception, so that supply the 3rd drive signal (Ba) to the 3rd sub-pixel (SP21) with predetermined repetition rate
Be used for increasing or reducing device (AC, the CO of the grade of second drive signal (Ga); CC) comprise and cut out compensator (CC), this is cut out compensator and is used to receive first of first drive signal (Ra) and can obtains minimum level (Rmi), first of first drive signal (Ra) can obtain greatest level (Rma), second input signal (G) and the 3rd input signal (B), to supply second drive signal (Ga) and the 3rd drive signal (Ba), can will surpass greatest level (MA) or fall below the minimum level (MI) if wherein detect first drive signal (Ra), then respectively with reference to the second and the 3rd input signal (G, B) grade increases or reduces the second and the 3rd drive signal (Ga, at least one in grade Ba).
3. according to the described driver of claim 1, wherein predetermined period (Tf; TS1) be frame period (Tf) or line period (TS1).
4. according to the described driver of claim 3, comprise in addition:
Frame memory (FM; FB), be used to store first input signal (R), supplying previous first input signal (Rp) of previous frame,
Whether be used to detect first drive signal (Ra) will exceed greatest level (MA) and maybe will fall the following device (LV1 of minimum level (MI); CC, Fr, Fg, Fb), this device comprises that first ultimate value determines circuit (Fr), be used to receive previous first input signal (Rp), with the grade from previous first input signal (Rp) begin to determine can by obtain to first sub-pixel (SP11) supply minimum level (MI) first can obtain minimum level (Rmi) and can by supply to first sub-pixel (SP11) first of greatest level (MA) acquisition can obtain greatest level (Rma) and
Be used for increasing or reducing device (AC, the CO of the grade of second drive signal (Ga); CC), this device comprises cuts out compensator (CC), being used to receive first can obtain minimum level (Rmi), first and can obtain greatest level (Rma) and second input signal (G), can will surpass greatest level (MA) or fall below the minimum level (MI) if detect first drive signal (Ra), then supply has respectively second drive signal (Ga) with respect to the grade increase of second input signal (G) or the grade that reduced.
5. according to the described driver of claim 4, wherein frame memory (FM; FB) be arranged for further storage second input signal (G), to supply previous second input signal (Gp) of previous frame, and wherein driver (D) comprises overdrive circuit (Og) in addition, be used to receive second drive signal (Ga) and previous second input signal (Gp), with second drive signal (Ga ') of overdriving to second sub-pixel (SP12) supply.
6. according to the described driver of claim 3, comprise in addition:
Frame memory (FB; FM), be used to store first drive input signal (Ra), supplying previous first drive signal (Rp) of previous frame, and store second drive signal (Ga), supplying previous second drive signal (Gp) of previous frame,
Whether be used to detect first drive signal (Ra) will exceed greatest level (MA) and maybe will fall the following device (LV1 of minimum level (MI); CC, Fr, Fg, Fb), this device comprises that first ultimate value determines circuit (Fr), be used to receive previous first input signal (Rp), with the grade from previous first drive signal (Rp) begin to determine can by obtain to first sub-pixel (SP11) supply minimum level (MI) first can obtain minimum level (Rmi) and can by supply to first sub-pixel (SP11) first of greatest level (MA) acquisition can obtain greatest level (Rma) and
Be used for increasing or reducing device (AC, the CO of the grade of second drive signal (Ga); CC), this device comprises cuts out compensator (CC), being used to receive first can obtain minimum level (Rmi), first and can obtain greatest level (Rma) and second input signal (G), can will surpass greatest level (MA) or fall below the minimum level (MI) if detect first drive signal (Ra), then supply has respectively second drive signal (Ga) with respect to the grade increase of second input signal (G) or the grade that reduced.
7. according to the described driver of claim 6, comprise overdrive circuit (Og) in addition, be used to receive second drive signal (Ga) and previous second drive signal (Gp), with second drive signal (Ga ') of overdriving to second sub-pixel (SP12) supply.
8. according to the described driver of claim 1, wherein be used for increasing or reducing device (AC, the CO of the grade of second drive signal (Ga); CC) be set to be used to change the grade of second drive signal (Ga), obtain basically and the first and second sub-pixel (SP11 with grade with first drive signal (Ra), SP12) first and second sub-pixels of the two expectation jump in brightness unanimity together (SP11, SP12) the two jump in brightness together.
9. according to the driver of claim 4 or 6, comprise source gamma corrector (Hr) in addition, be used to receive obtainable minimum level (Rmi) and obtainable greatest level (Rma), with to cutting out compensator (CC) supply through the minimum level (rmi) of source gamma correction with through the greatest level (rma) of source gamma correction.
10. according to claim 4 or 6 described drivers, comprise display gamma corrector (Kr) in addition, be used to receive first drive signal (Ra), with first drive signal (Ra2) of supply through proofreading and correct.
11. according to the described driver of claim 4, wherein pixel (Pk) comprises the 3rd sub-pixel (SP21) in addition, driver (D) is arranged for the 3rd input signal (B) that the third phase prestige jump in brightness of the 3rd sub-pixel (SP21) is represented in further reception, to supply the 3rd drive signal (Ba) with frame rate to the 3rd sub-pixel (SP21), this frame rate is the inverse of frame period (Tf)
Frame memory (FB) is set to be used for further store second input signal (G) and the 3rd input signal (B), supplying previous second input signal (Gp) and previous the 3rd input signal (Bp) respectively,
Device (the LV1 that is used to detect; CC, Fr, Fg Fb) further comprises:
-the second ultimate value is determined circuit (Fg), be used to receive previous second input signal (Gp), with the grade from previous second input signal (Gp) begin to determine can by obtain to second sub-pixel (SP12) supply minimum level (MI) second can obtain minimum level (Gmi) and can by supply to second sub-pixel (SP12) second of greatest level (MA) acquisition can obtain greatest level (Gma) and
-Di three ultimate values are determined circuit (Fb), be used to receive previous the 3rd input signal (Bp), with the grade from previous the 3rd input signal (Bp) begin to determine can by obtain to the 3rd sub-pixel (SP21) supply minimum level (MI) the 3rd can obtain minimum level (Bmi) and can by supply to the 3rd sub-pixel (SP21) the 3rd of greatest level (MA) acquisition can obtain greatest level (Bma) and
-cut out compensator (CC), be set to be used for further receive the 3rd input signal (Bp), to supply the 3rd drive signal (Ba), can will surpass greatest level (MA) or fall below the minimum level (MI) if wherein detect first drive signal (Ra), the then relative second and the 3rd input signal (G, B) grade increases or reduces the second and the 3rd drive signal (Ga, at least one grade Ba) respectively.
12. a display device comprises described driver of claim 1 (D) and display panel (1).
13. a display device comprises described display device of claim 12 and signal processing circuit (SPC).
14. a driving comprise and have first and second sub-pixels that inertia is all arranged (this method comprises for SP11, the method for the matrix display panel of pixel SP12) (Pk):
Receive (D) and represent the first and second sub-pixel (SP11 respectively, SP12) the first and second expectation jump in brightness (BT1, BT2) the first and second input signal (R, G), with predetermined repetition rate to the first and second sub-pixel (SP11, SP1 2) respectively supply (D) first and second drive signals (Ra Ga), receives and the step of supply (D) comprising:
-detect (LV1 for the inertia that compensates first sub-pixel (SP11); CC, Fr, Fg, Fb) whether first drive signal (Ra) will surpass greatest level (MA) or drop on minimum level (MI) following so that make the sub-pixel of winning (SP11) can be at an independent predetermined period (Tf; TS1) finish basically within first the expectation jump in brightness (BT1), wherein predetermined period be predetermined repetition rate inverse and
-if detecting first drive signal (Ra) can will surpass greatest level (MA) or fall below the minimum level (MI), then increases or reduce (AC, CO respectively; CC) grade of second drive signal (Ga).
CNA2005800107563A 2004-04-01 2005-03-25 Driving a matrix display Pending CN1998042A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101739965B (en) * 2008-11-07 2013-02-13 奇美电子股份有限公司 Driving method of liquid crystal panel and liquid crystal display
CN107274854A (en) * 2017-06-20 2017-10-20 友达光电股份有限公司 Display device and gamma curve compensation circuit and driving method thereof

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090059581A1 (en) * 2006-02-27 2009-03-05 Keiji Hayashi Display Device
KR101179215B1 (en) 2006-04-17 2012-09-04 삼성전자주식회사 Driving device and display apparatus having the same
EP1962049B1 (en) * 2007-02-21 2015-12-23 Agfa HealthCare N.V. System and method for optical coherence tomography
EP1962082A1 (en) * 2007-02-21 2008-08-27 Agfa HealthCare N.V. System and method for optical coherence tomography
EP1962050B1 (en) 2007-02-21 2015-12-23 Agfa HealthCare N.V. System and method for optical coherence tomography and method for calibrating such a system
EP1962051A1 (en) * 2007-02-21 2008-08-27 Agfa HealthCare N.V. System and method for optical coherence tomography
EP1962080B1 (en) * 2007-02-21 2011-06-01 Agfa HealthCare N.V. System for optical coherence tomography
EP1962079B1 (en) * 2007-02-21 2016-06-01 Agfa HealthCare N.V. System and method for optical coherence tomography
JP5173342B2 (en) * 2007-09-28 2013-04-03 株式会社ジャパンディスプレイイースト Display device
RU2011152357A (en) 2009-05-22 2013-06-27 Шарп Кабусики Кайся IMAGE DISPLAY DEVICE
JP2015057637A (en) * 2013-08-09 2015-03-26 セイコーエプソン株式会社 Integrated circuit, display device, electronic device, and display control method
JP6288818B2 (en) * 2013-11-11 2018-03-07 株式会社Ｊｏｌｅｄ Signal generation apparatus, signal generation program, signal generation method, and image display apparatus
CN104155789B (en) * 2014-08-05 2017-02-15 上海中航光电子有限公司 Pixel structure and pixel compensation method thereof
WO2017188347A1 (en) * 2016-04-28 2017-11-02 シャープ株式会社 Liquid crystal display device, drive method for liquid crystal panel, setting method for write signal for liquid crystal display device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100632713B1 (en) * 1997-07-22 2006-10-13 코닌클리케 필립스 일렉트로닉스 엔.브이. Display device
ES2143883T3 (en) * 1998-04-17 2000-05-16 Barco Nv CONVERSION OF A VIDEO SIGNAL TO ACTUATE A LIQUID CRYSTAL DISPLAY.
JP2003029713A (en) * 2001-07-06 2003-01-31 Internatl Business Mach Corp <Ibm> Liquid crystal display device, liquid crystal display drive circuit, driving method of the liquid crystal display and program therefor
JP4537679B2 (en) * 2003-09-18 2010-09-01 株式会社東芝 Liquid crystal display
JP2005141190A (en) * 2003-10-16 2005-06-02 Hitachi Ltd Display device
US7696988B2 (en) * 2004-04-09 2010-04-13 Genesis Microchip Inc. Selective use of LCD overdrive for reducing motion artifacts in an LCD device
KR101094674B1 (en) * 2004-04-13 2011-12-20 타미라스 퍼 피티이. 엘티디., 엘엘씨 Pixel overdrive for an LCD panel with a very slow presponse pixel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101739965B (en) * 2008-11-07 2013-02-13 奇美电子股份有限公司 Driving method of liquid crystal panel and liquid crystal display
CN107274854A (en) * 2017-06-20 2017-10-20 友达光电股份有限公司 Display device and gamma curve compensation circuit and driving method thereof
CN107274854B (en) * 2017-06-20 2020-03-17 友达光电股份有限公司 Display device and gamma curve compensation circuit and driving method thereof

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